Visual inspection
Inspect cylinder walls for scratches, roughness or ridges which indicate excessive wear. If cylinder bore is very rough or deeply scratched, or ridged, rebore cylinder and use over size piston.
Cylinder bore diameter, taper and out-of-round
Using a cylinder gauge (1), measure cylinder bore in thrust and axial directions at two positions (“a” and “b”) as shown in the figure.
If any of the following conditions is noted, rebore cylinder.
1)
Cylinder bore dia. exceeds limit.
2)
Difference of measurements at two positions exceeds taper limit.
3)
Difference between thrust and axial measurements exceeds out-of-round limit.
Limit on cylinder bore diameter
78.114 mm (3.073 in.)
Limit on cylinder taper and out-of-round
Limit: 0.10 mm (0.004 in.)
NOTE:
If any one of four cylinders has to be rebored, rebore all four to the same next oversize. This is necessary for the sake of uniformity and balance.
“a”:
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50 mm (1.96 in.)
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“b”:
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95 mm (3.74 in.)
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